#!/bin/bash

### 信号处理演示

trap 'rm -f /tmp/my_tmp_file_$$' INT
echo "creating file /tmp/my_tmp_file_$$"
date >"/tmp/my_tmp_file_$$"

echo "Press interrupt (Ctrl-C) to interrupt...."
while [ -f "/tmp/my_tmp_file_$$" ]; do
    echo "File exists"
    sleep 1
done
echo "The file no longer exists"

trap INT
echo "creating file /tmp/my_tmp_file_$$"
date >"/tmp/my_tmp_file_$$"

echo "Press interrupt (Ctrl-C) to interrupt...."
while [ -f "/tmp/my_tmp_file_$$" ]; do
    echo "File exists"
    sleep 1
done

echo "We never get here"

exit 0
